Window colour

[phillip_Qt]

Hi all
Can any body tell me how to add colour in windows. i need 2 change the colour of windows to red from default. but im not able 2 do.

Thank you all

[wysota]

You mean the background? Make sure the autoFillBackground property of the widget is set to true and set a colour of your choice as QPalette::Background role of the widget's palette.

[phillip_Qt]

Ya autoFillBackground is set as True. i also added
ui.CancelButton->setBackgroundRole((QPalette::ColorRole)Qt::red ); in constructor as i need cancelButton as red. But nothing is working. Can u plz tell me how to colour the window.



Thank you.

[ashukla]

QPalette palette;
QBrush brush(QColor(255, 255, 255, 255));
brush.setStyle(Qt::SolidPattern);
palette.setBrush(QPalette::Active, QPalette::Base, brush); /*It is for Widget Base Background*/
QBrush brush1(QColor(255, 0,0, 255));
brush1.setStyle(Qt::SolidPattern);
palette.setBrush(QPalette::Active, QPalette::Window, brush1);/*It is for widget Background*/
palette.setBrush(QPalette::Inactive, QPalette::Base, brush);
palette.setBrush(QPalette::Inactive, QPalette::Window, brush1);
palette.setBrush(QPalette::Disabled, QPalette::Base, brush1);
palette.setBrush(QPalette::Disabled, QPalette::Window, brush1);
ui.CancelButton->setPalette(palette);
then Make sure the autoFillBackground property of the widget is set to true.
hope this help!

[wysota]

in constructor as i need cancelButton as red.

Oh... a "red push button" issue :) You'll have to use stylesheets for that ( background-color: red; ).

[phillip_Qt]

I ve solved the problem.

Thank you all .

[phillip_Qt]

HI all.
I ve changed the colour of window by usning the code


QPalette p( this->palette());
p.setColor( QPalette::Window, QColor(Qt::black));
this->setPalette(p);

now i need to check the window colour. if it is black i need 2 change it to gray and vice versa. i Tried to do as below but its not working


if(QMainWindow::backgroundRole() == Qt::black)
{
QPalette p( this->palette());
p.setColor( QPalette::Window, QColor(Qt::gray));
this->setPalette(p);
}

But its not coming inside if loop.
Can any body help me.
thank you all.

[wysota]

Read what QWidget::backgroundRole does. It returns a role, not a colour.

[jpn]

QWidget::backroundRole() returns QPalette::ColorRole. It makes no sense to compare it to Qt::GlobalColor.



if (palette().color(Qt::Window) == Qt::black)
...

[phillip_Qt]

I tried to do like following.

if(palette.color(QPalette::Window) == Qt::black)
{
GrayColour();
}
still its not coming inside, but it showd come inside as the windows colour is black.

Then what to do Mr Wysota.? can u plz help me.

Thanks.

[wysota]

Have a boolean flag instead of checking the colour.

[phillip_Qt]

Have a boolean flag instead of checking the colour.

Thank for the Reply.:) Actually my requirment is if i run my programm the back grond colour of the system should change to gray including the IDE colour. But in my case only output window colour is getting changed.:(

Can u plz help me, how to do this.

[wysota]

You won't be able to change colours of other applications using Qt code.

[phillip_Qt]

You won't be able to change colours of other applications using Qt code.

Actully in MFC it can be done by using SetSysColor(). i need to know is there any replacment for this in Qt.

[wysota]

As I said, you won't be able to modify the behaviour of other applications using Qt code. SetSysColor() is not an MFC method, it's WinAPI function, so you can call it from Qt-based applications as well.

[phillip_Qt]

As I said, you won't be able to modify the behaviour of other applications using Qt code. SetSysColor() is not an MFC method, it's WinAPI function, so you can call it from Qt-based applications as well.

Can u plz tell me an example how to call Win32 API in Qt.

Thanx

[wysota]

Just call the function :)

[phillip_Qt]

I tried to call like

quint32 m_ColourElement = COLOR_3DDKSHADOW;
quint32 m_ColourNight = RGB(100, 100, 100);
SetSysColors(16, m_ColourElement, m_ColourDay);


But getting erors.

[wysota]

What kind of errors?

[jpn]

Can u plz tell me an example how to call Win32 API in Qt.
Qt is not a programming language but a library.


I tried to call like

quint32 m_ColourElement = COLOR_3DDKSHADOW;
quint32 m_ColourNight = RGB(100, 100, 100);
SetSysColors(16, m_ColourElement, m_ColourDay);


But getting erors.
Perhaps you should read SetSysColors() (http://msdn2.microsoft.com/en-us/library/ms724940(VS.85).aspx) docs...

[phillip_Qt]

What kind of errors?

mainwindow.cpp(33) : error C2065: 'COLOR_3DDKSHADOW' : undeclared identifier
.\mainwindow.cpp(34) : error C3861: 'RGB': identifier not found
.\mainwindow.cpp(35) : error C2065: 'm_ColourDay' : undeclared identifier
.\mainwindow.cpp(35) : error C3861: 'SetSysColors': identifier not found

Theses error.

[jpn]

mainwindow.cpp(33) : error C2065: 'COLOR_3DDKSHADOW' : undeclared identifier
.\mainwindow.cpp(34) : error C3861: 'RGB': identifier not found
.\mainwindow.cpp(35) : error C2065: 'm_ColourDay' : undeclared identifier
.\mainwindow.cpp(35) : error C3861: 'SetSysColors': identifier not found
As I said, read SetSysColors() (http://msdn2.microsoft.com/en-us/library/ms724940(VS.85).aspx) docs. Look at the bottom where it says "Header".

[phillip_Qt]

What kind of errors?

Im getting following errors.

.\mainwindow.cpp(33) : error C2065: 'COLOR_3DDKSHADOW' : undeclared identifier
.\mainwindow.cpp(35) : error C3861: 'SetSysColors': identifier not found

Thank you.

[phillip_Qt]

Qt is not a programming language but a library.


Perhaps you should read SetSysColors() (http://msdn2.microsoft.com/en-us/library/ms724940(VS.85).aspx) docs...


#ifdef OS_WINDOWS
quint32 m_ColourElement = COLOR_3DDKSHADOW;
quint32 m_ColourNight = qRgb(100, 100, 100);
SetSysColors(16, m_ColourElement, m_ColourNight);
#endif

Is it right?

[jpn]

Is it right?
No, it's not. First of all, where is OS_WINDOWS defined? Qt does not define such but something similar. Read QtGlobal docs what Qt defines. Secondly, you must include the header mentioned in SetSysColors() docs. Otherwise compiler doesn't know any SetSysColors() function. Thirdly, SetSysColors() doens't take parameters like that. Read SetSysColors() docs what type of parameters it takes.